Spark-plug.



H. A. DUHTCH.

SPARK PLUG.

APPLICATION FILED FEB. 2. l9l6.

L21 66909@ mem@ 13, 1917.

Attorneys eitizen or' the'` Unitecl States, resug ut Des rMoiuee, iu the eouuty oit Pollreud State of 55 lewe, bei e invented e .uew uur/l useful Spello llllug, of which the llowug is e specifica tion.

lhe present invention uppeituius to spe-rk plugs, and aims to provide e novel etteclrmeut for sport: plugs 'to protect the electrodes from oil., so that the spark plug utiliziug the attachment is uct liable 'to foul.

llt is the object ot' the invention to provide u protector uftteeliutle to the limer eucl of u spark plof" to iueclose the electrodes whereby the oil i. the cylinder to which the folug le 'et ed euuoot loe oreeel against tlie eleetree insulated parte, ugual this will euoitl e.llculties iueieleut to ordi 11er); sjoellrlugs due the presence oit oil und reeulteut soot or eer'ton upori the elecu trooles.

llt ie oleo Witliu the scope of the invention to provide e spart: protector ot the sueture indicated which is extremely simple and ueripeusive iu construction, und which may be used upon 4various sport. plugs, the l clevoe being practical :u1-el eieieut iu use.

With the foregoing other objects iu View which will appear the deeeriptiou proceeds, the invention resides in the corn binution auol arrangement of parte and iu. 'the details ott construction hereinafter clescribed und eleirnecl, it loeiug uriderstoecl theft ehzmges in tire recite em oorlimeut of the invention herein disclosed eau loe with inthe Se wl?. iiue without ele- 'j the invention.

*eel iu the eccom- Y F wr l'u SG The eport: plug illuetreteil ooustructiou7 .embodyiY1 aviug a reflueecl teru...uel erlupteo?. to Tee threaded luto the cylinder7 aucl en iusuletor i 1s secured Wtluu the Shell usuel luf v2 is of Cupehupe,

later 3 and is provided the central electrode t?.

The protector Y illustrated in Figs. Il and und has o reduced porits mouth aud threaded into the inner or lower terminal 2 of the shell l to attach the protector :is to iuclose the electrode 6, the protector 7 seating against the end of the shell. The protector 7 has :L chamber 9 into which the electrode projects, und the bottom or closed end of the protector 9 rounded or converted, :is :it l0, to deflect 'the oil later`- ally uu'ug'li'rom the protector when the oil is forced toward the plug; during the oompression Stroke or otherwise.

'llie protector 7 has o peripheral or cirjuceut its bottom tlou 8 surrounding cuuoereutal YGroove ll ud or closed onu, oud the protector has diemetrioaliy opposite slots; or apertures 12 extending from the chamber 9 to the groove 1l. It will thus lie observed that the protector 7 has a peripheral or annular rib between the groove ll und rouurlerl delectiug end l0, so that' the apertures 12 are more effectively` protected from the oil. The apertures l2 permit the oerbureterl or to circulate through the protector around the electrodes, in order that the spark will ignite the charge ne usual. lu the present oase, the grounded electrodeA is carried bythe protector, und embodies u, cluiuetriosil piu 13 providing" the eleetroale witlxiu the chamber beyond but adjacent the ol? the electrode 6, sol that the sparks will jump the gap hetweeu the eleetrorlee Within Lire chamber ltllieu the protector Y ie used upon the it oroteets 'the electreales so that the l other extraneous; matter cannot eucouuter the eleetroflee or insulate@ ports, und 'this pre'veuts the plufgF from fouling, but doe nr the utility of the 'plug uot u fu'uipose ignition. The r'ouuclecl or i N t protector is of adventuge Since it oei'leets the oil laterally away :trom tire electro-fles, and served that the l .rteetor ucloses the eleotrofles and is imperlforate with the exceptlou of 'the restricted lateral apertures or openings through which the earbureted oir can circulate lto the shell so at its inner end with it will also be ob- 'i Theplug illustrated in Fig. 3 is of the same construction as the plug above de scribed, but the grounded electrode 6 is attached to the terminal 2 of the shell 1 in the ordinary manner to cooperate with the central electrode 6. The protector 7 in this case is stamped from suitable sheet 'metal and 1s of rounded or convexed formation to protect the electrodes, the rim of the protector 7 having diainetrica-lly opposite arcuate lips 8 parallel with the axis of the protector and soldered or otherwise secured to the terminal 2 of the shell 1. The lips 8 provide lateral openings 12 disposed opposite one another. The protector 7 prevents the oil from being forced against the electrodes and deleets the oil laterally away vfrom the. electrodos.

mouth portion is reduced for engaging.

within one end of the shellof a spark plug, Said protector being adapted to inclose the central electrode of the spark plug and having a closed bottom, the Walls of the pro' tector having two diametrically/opposite openings adjacent` thel bottom thereof, and a diametrical pin carried by the Walls of the protector adjacent the bottom thereof below and at right angles with the axis of said openings and providing an electrode coperable with the central electrode of the spark plug.

In testimony that I claim the foregoing as my own, I have .hereto aiiixed my signature in the presence of two witnesses.

HENRY A. DORTCH.

Witnesses H. S. MiLLER, ll. F. GILLAM. 

